Chapter 1: Tools of Geometry

1-2

Drawings, Nets, & Other Models

Objectives

• To make isometric and orthographic drawings

• To draw nets of three-dimensional figures

Isometric Drawing

• “isos” = equal

• “metron” = measure

• All 3-D measurements are scaled equally

• Use isometric dot paper to show three sides of a figure from a corner view

Example 1

• Make an isometric drawing of the cube structure on page 10 of your book.

Orthographic Drawing

• Shows a top view, a front view, and a right-side view

• Like a blueprint of a building

Example 2

• Make an orthographic drawing of the figure on page 11 of your book.

Foundation Drawing

• Shows the base of a structure and the height of each part

• Used for skyscrapers!

Example 3

• Make a foundation drawing for the isometric drawing on page 11 of your book.

Nets

• Two-dimensional pattern that you can fold to form a three-dimensional figure

• Shows all of the surfaces of a figure in one view

Example 4

• What figure will this net make?

Example 5

• Draw a net for the graham cracker box.

Homework

• P. 13-15

• 1-16 all (with work)

• 23-26

• 28-30